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有句俗话“蜘蛛结网,久雨必晴”,意思是说：阴雨天,蜘蛛开始张网捕捉昆虫,预示天将转晴；反之,蜘蛛收网,则预示天将下雨。那么,蜘蛛为什么会有这种预知天气的能力呢? A：科学家研究发现,蜘蛛能预测天气主要是因为它对空气的湿度变化相当敏感。原来,在蜘蛛的尾部有许多小吐丝器,吐丝器部分既黏又凉。阴雨天来临时,由于空气湿度大、水汽多,水汽易在蜘蛛的吐丝器上凝结成小水珠,这样蜘蛛吐丝时感到困难,便停止放丝而收网了。相反,当空气湿度变小,天气转好时,没有了小水珠的干扰,蜘蛛就能顺利吐丝张网捕虫了。
There is a saying that “Spider webs, long rain will be clear,” means: On rainy days, the spiders began to trap insects webbed, indicating that the sky will be fine; the other hand, the spider to close the net, it indicates that the sky will rain. So why do spiders have this ability to predict the weather? A: Scientists found that spiders can predict the weather mainly because it is very sensitive to changes in air humidity. It turned out that in the tail of the spider there are many small silks, part of the silo both sticky and cold. When the rainy days come, due to the air humidity, water vapor, water vapor in the spider’s spinneret condensate into small drops of water, so spider silk difficult, stop putting the wire and close the net. On the contrary, when the air humidity becomes smaller, the weather turns better, there is no interference of small drops of water, and spiders can spit on one another.